JP5418806B2 - Light source device and projector - Google Patents

Description

  The present invention relates to a light source device and a projector incorporating the light source device.

  2. Description of the Related Art Today, a projector as an image projection apparatus that projects a screen of a personal computer, a video image, an image based on image data stored in a memory card or the like onto a screen is widely used. This projector focuses light emitted from a light source on a micromirror display element called DMD (digital micromirror device) or a liquid crystal plate, and displays a color image on a screen.

  In the past, projectors using a high-intensity discharge lamp as the light source have been the mainstream, but in recent years, development has been made to use solid-state light emitting elements such as red, green, and blue light emitting diodes and organic EL as the light source. Many proposals have been made. For example, Japanese Patent Application Laid-Open No. 2004-341105 (Patent Document 1) proposes a light source device including a phosphor layer that converts ultraviolet light emitted from a solid light source into visible light, a base material, and a solid light source.

  However, since the proposal of Patent Document 1 uses an excitation light source that uses high-energy ultraviolet light as excitation light, the optical component irradiated with ultraviolet light is easily damaged, and the long-term life of the optical component is ensured. There was a problem that it became difficult.

Therefore, in Japanese Patent Application No. 2008-127947 (patent document 2) filed by the applicant of the present application, a predetermined wavelength band light is generated by irradiating the phosphor with visible light having lower energy than ultraviolet light as excitation light, Proposals have been made on light source devices that can suppress deterioration over time of optical components irradiated with excitation light and maintain performance over a long period of time.
JP 2004-341105 A Japanese Patent Application No. 2008-127947

  The proposal of Patent Document 2 is directed to exciting visible light such as blue light with a laser emitter or the like on a rotating plate in which a phosphor layer or a diffusion layer, which is a light emitting member, is formed adjacent to each other in the circumferential direction. Irradiated as light, each color such as red, green, and blue can be generated in sequence. However, when excitation light is applied to the gap between the light emitting members such as the phosphor layer and the diffusion layer, excitation light is emitted from the gap. Has passed as it is, and a blue spot is formed in the image projected on the screen. Further, when the number of light source bodies constituting the excitation light source is increased in order to obtain a predetermined luminance, there is a problem that the number of blue spots projected on the screen increases.

The invention, object all SANYO been made in view of such problems of the prior art, a light source device capable of projecting a clear image on the screen, to provide a projector which includes the light source device It is said.

The light source device of the present invention is a rotating plate in which different light emitting members that receive directional excitation light and emit light of a predetermined wavelength band are arranged adjacent to each other in the circumferential direction of a circular base material that can be rotationally controlled. And an excitation light source for irradiating the light emitting member with the excitation light, and when the gap between the light emitting members is positioned on the optical axis of the excitation light source, the light of the excitation light source directs the gap between the light emitting members. Control means for turning off the excitation light source so as not to pass in a certain state .

  The excitation light source emits excitation light in a blue wavelength band, and the rotating plate receives a light emitting member that receives the excitation light and emits red wavelength band light, and the excitation light. A light emitting member that emits green wavelength band light, and a light emitting member that diffuses and emits the incident excitation light.

The excitation light source emits blue wavelength band excitation light and ultraviolet wavelength band excitation light, and the rotating plate receives the blue wavelength band excitation light and receives red light. A light emitting member that emits light in the wavelength band of blue , a light emitting member that emits light in the wavelength band of green by receiving the excitation light in the blue wavelength band, and light in the blue wavelength band that receives the excitation light in the ultraviolet wavelength band And a light emitting member that emits light.
In that case, the blue wavelength band excitation light source is turned on when a light emitting member that emits the red wavelength band light or a light emitting member that emits the green wavelength band light is positioned on the optical path, It is preferable that the blinking control is performed so that the light emitting member emitting the blue wavelength band light is located on the optical path so that the light emitting member is turned off.
In this case, the excitation light source in the ultraviolet wavelength band is turned on when a light emitting member that emits the blue wavelength band light is positioned on the optical path, and emits the red wavelength band light on the optical path. It is desirable to control blinking so that the member and the light emitting member that emits light in the green wavelength band are turned off.

Further, the rotating plate may be provided with a light shielding member that shields excitation light in a gap between the light emitting members.
Further, the light shielding member may be formed as a diffusion layer.
The light shielding member may be formed flat together with the non-reflective coating layer.
Further, the light shielding member may be formed of a flexible material.
The rotating plate may have a diffusion layer disposed on the entire surface of each light emitting member.
Furthermore, the light source device of the present invention includes a diaphragm disposed adjacent to a rectangular base material capable of reciprocating different light emitting members that receive directional excitation light and emit light of a predetermined wavelength band, The excitation light source that irradiates the light emitting member with the excitation light and the light of the excitation light source has directivity in the gap between the light emitting members when the gap between the light emitting members is positioned on the optical axis of the excitation light source Control means for turning off the excitation light source so as not to pass in a state.

The projector of the present invention includes a light source device, a display element , a light source side optical system that guides light from the light source device to the display element, and a projection that projects an image emitted from the display element onto a screen. And a projector control means for controlling the light source device and the display element, and the light source device is the light source device described above.

ADVANTAGE OF THE INVENTION According to this invention, the light source device which can project a clear image on a screen, and a projector provided with the said light source device can be provided .

Hereinafter, the embodiments of the present invention will be explained in detail with reference to FIG. As shown in FIG. 1, a projector 10 according to one embodiment of the present invention has a substantially rectangular parallelepiped shape, and a lens cover 19 that covers a projection port on the side of a front plate 12 that is a side plate in front of a main body case. The front plate 12 is provided with a plurality of exhaust holes 17.

  The top plate 11 which is a main body case has a key / indicator unit 37. The key / indicator unit 37 includes a power switch key, a power indicator for notifying power on / off, a light source device, and the like. It is provided with keys and indicators such as an overheat indicator for notifying when overheated.

  Further, on the back of the main body case, various terminals 20 such as an input / output connector portion and a power adapter plug, etc., which are provided with a USB terminal, a D-SUB terminal for inputting image signals, an S terminal, an RCA terminal, etc. on the back plate, a memory not shown A card slot and an Ir receiver for receiving control signals from the remote controller are provided.

  The rear plate, the right side plate which is a side plate of the main body case (not shown), and the lower portion of the left side plate 15 which is the side plate shown in FIG. It is.

  As shown in FIG. 2, the projector control means of the projector 10 includes a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like. The image signals of various standards input from the connector unit 21 are converted so as to be unified into an image signal of a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). Thereafter, it is sent to the display encoder 24.

  The display encoder 24 develops and stores the transmitted image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display drive unit 26.

  A display drive unit 26 to which a video signal is input from the display encoder 24 drives a display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal sent. Yes, the light from the light source device 63 is incident on the display element 51 through the illumination unit that forms the light source side optical system, thereby forming a light image with the reflected light of the display element 51 and forming the projection side optical system. The movable lens group 97 of the projection side optical system is driven for zoom adjustment and focus adjustment by a lens motor 45. .

  In addition, the image compression / decompression unit 31 performs a recording process for sequentially writing a luminance signal and a color difference signal of an image signal to a memory card 32 that is a removable recording medium by performing data compression by processing such as ADTC and Huffman coding. In the mode, the image data recorded on the memory card 32 is read, and individual image data constituting a series of moving images is expanded in units of one frame and sent to the display encoder 24 via the image conversion unit 23. A moving image or the like can be displayed based on the stored image data.

  The control unit 38 controls the operation of each circuit in the projector 10, and includes a ROM that stores operation programs such as a CPU and various settings fixedly, and a RAM that is used as a work memory. ing.

  Further, the operation signal of the key / indicator unit 37 composed of the main key and the indicator provided on the upper surface plate 11 of the main body case is directly sent to the control unit 38, and the key operation signal from the remote controller is received by Ir. The code signal received by the unit 35 and demodulated by the Ir processing unit 36 is sent to the control unit 38.

  An audio processing unit 47 is connected to the control unit 38 via a system bus (SB). The audio processing unit 47 includes a sound source circuit such as a PCM sound source, and converts the audio data into analog data in the projection mode and the playback mode. The speaker 48 can be driven to emit loud sounds.

  The control unit 38 controls the power supply control circuit 41. The power supply control circuit 41 turns on the light source device 63 when the power switch key is operated. Further, the control unit 38 also controls a cooling fan drive control circuit 43. The cooling fan drive control circuit 43 performs temperature detection by a plurality of temperature sensors provided in the light source device 63, etc. The rotation speed is controlled, and the rotation of the cooling fan is continued even after the light source device 63 is turned off by a timer or the like. Further, depending on the result of temperature detection by the temperature sensor, the light source device 63 is stopped and the projector main body is stopped. Control such as turning off the power is also performed.

  Further, as shown in FIG. 3, the projector 10 has an internal structure in which a power supply control circuit board 102 to which a light source power supply circuit block 101 and the like are attached is disposed in the vicinity of the right side plate 14, and the inside of the casing is divided into partition walls 120. The air intake side space chamber 121 on the back plate 13 side and the exhaust side space chamber 122 on the front plate 12 side are formed in an airtight manner, and a sirocco fan type blower 110 is arranged as a cooling fan near the center of the projector 10, The suction port 111 of the blower 110 is positioned in the space chamber 121, and the discharge port 113 of the blower 110 is positioned in the exhaust side space chamber 122.

  Further, a light source device 63 is disposed in the exhaust side space 122, and an optical unit block 77 including an illumination side block 78, an image generation block 79, and a projection side block 80 is disposed along the left side plate 15. 77. The illumination side block 78 is communicated with the exhaust side space chamber 122 so that a part of the illumination unit provided in the illumination side block 78 is located in the exhaust side space chamber 122. An exhaust temperature reducing device 114 is disposed along the face plate 12.

  The blower 110 as a cooling fan for cooling the light source device 63 and the like has a suction port 111 in the center, the discharge port 113 has a substantially square cross section, and is connected to the partition partition 120, and the partition partition 120 Exhaust air from the blower 110 is discharged into the exhaust-side space chamber 122 partitioned by the control circuit board 103 in the vicinity of the suction port 111 of the blower 110.

  The optical unit block 77 is disposed in the vicinity of the light source device 63, and includes an illumination side block 78 that includes a part of the illumination unit and emits light emitted from the light source device 63 toward the image generation block 79, and illumination. An image generation block 79 that includes a part of the display unit 51 and the display element 51 and reflects the emitted light from the illumination side block 78 to the projection side block 80 in accordance with the image data, and a projection unit of the left side plate 15 It is composed of three blocks, a projection side block 80 which is arranged in the vicinity and projects the light reflected by the image generation block 79.

  As a part of the illumination unit forming the light source side optical system 61 provided in the illumination side block 78, there is a light guide device 75 that uses light emitted from the light source device 63 as a light flux having a uniform intensity distribution.

  Further, as a part of the illumination unit forming the light source side optical system 61 included in the image generation block 79, the reflection mirror 74 that changes the direction of the light emitted from the light guide device 75, and the reflection mirror 74 reflects the light. There is a condensing lens group 83 that condenses the emitted light on the display element 51 and an irradiation mirror 84 that irradiates the display element 51 with light transmitted through the condensing lens group 83 at a predetermined angle. The image generation block 79 also includes a display element 51, and the display element 51 employs DMD. Further, a display element heat dissipation plate 53 for cooling the display element 51 is disposed on the back plate 13 side of the display element 51.

  In this DMD, a plurality of micromirrors are arranged in a matrix, and light incident from an incident direction inclined in one direction with respect to the front direction is converted into an on-state light beam in the front direction by switching the tilt direction of the plurality of micromirrors. The image is displayed by being reflected separately from the off-state light beam in the oblique direction, and the light incident on the micromirror tilted in one tilt direction is reflected in the front direction by this micromirror and turned on. The light incident on the micromirror tilted in the other tilt direction is reflected by the micromirror in an oblique direction to form an off-state light beam, and the off-state light beam is absorbed by the light absorption plate and reflected in the front direction. The image is generated by the bright display by and the dark display by reflection in the oblique direction.

  The projection-side block 80 includes a projection unit having a fixed lens group 93 and a movable lens group 97 that form a projection-side optical system 62 that irradiates a screen or the like (not shown) with a brightly displayed light beam that forms an image. Is. The lens group of these projection-side optical systems 62 is a variable-focus lens having a zoom function, and is described above by the optical system control board 86 disposed between the optical unit block 77 and the left side plate 15. The lens motor 45 is controlled to move the movable lens group 97 along the optical axis, thereby enabling zoom adjustment and focus adjustment.

  The light source device 63 includes a light emitting wheel 71 that receives directional excitation light and emits light of each wavelength band to the light guide device 75, and an excitation light source 72 that irradiates the light emitting member with the excitation light. In the vicinity of the front plate 12, the excitation light source 72 emits light so that the optical axis of the excitation light source 72 is substantially coincident with the optical axis of the light guide device 75 and parallel to the rotation axis of the light emission wheel 71. It is arranged to face the wheel 71.

  In addition, the light emitting wheel 71 has a rotating plate disposed adjacent to the circumferential direction of the base material 130 made of a disc-shaped transparent material capable of controlling rotation of different light emitting members, and is attached to the central portion of the base material 130. The wheel motor 73 is rotatably arranged.

  4 and 5, the light source device 63 includes a phosphor contained in the phosphor layer 131, which is a light emitting member, when the excitation light from the excitation light source 72 is applied to the light emitting wheel 71, or The light of a predetermined wavelength band is emitted from the diffusion layer 135 that is a light emitting member, and the emitted light is incident on the light guide device 75.

  The light emitting wheel 71 is composed of a rotating plate having a plurality of different types of light emitting members on a circular base material 130 and a wheel motor 73, and a connection portion with the wheel motor 73 at the center of the base material 130. A circular opening corresponding to the shape of the cylindrical rotor is formed, and the rotor is inserted into the circular opening to be integrated. As a result, the rotating plate of the light emitting wheel 71 is rotated by the wheel motor 73 that is driven and controlled by the control unit 38 of the projector control means at a rotational speed of about 120 times per second.

  The base material 130 has a plurality of fan-shaped segment regions adjacent to each other in the circumferential direction, and is formed of a glass base material, a transparent resin base material, or the like. And this base material 130 has the 1st thru | or 3rd three segment area | regions 141-143, and the wavelength of red (R) which is a primary color by receiving excitation light on one surface of the 1st area | region 141 A red phosphor layer 131R, which is a light emitting member that emits band light, is fixed, and one surface of the second region 142 emits light that emits green (G) wavelength band light that is a primary color upon receiving excitation light. A green phosphor layer 131G as a member is fixed. Further, the phosphor layer 131 is not disposed in the third region 143, and the first region and the second region 141, 142 are incident on the surface of the third region 143 on the side where the phosphor layer 131 is disposed. An optical material that imparts a diffusion effect to the excitation light is disposed as the diffusion layer 135.

  The base material 130 can also be formed of three filter pieces corresponding to the first to third regions 141 to 143 which are three segment regions. The phosphor layer 131 is fixed and diffused by each filter piece. The layer 135 may be formed, and then combined in a circular shape and bonded, or may be integrated by an attachment member or the like.

  The phosphor layer 131 is composed of a phosphor crystal and a binder, and the diffusion layer 135 is blasted on the surface of the substrate 130 in addition to fixing a solid material as an optical substance. It may be formed by applying an optical process such as a roughing process.

  The substrate 130 transmits excitation light to the entire surface on the side where the phosphor layer 131 and the diffusion layer 135 formed as a light emitting member are disposed, and excitation light such as wavelength band light emitted from the phosphor. A dichroic layer 134 that reflects light in a wavelength band other than the above is formed by coating, and a phosphor layer 131 and a diffusion layer 135 are formed on the dichroic layer 134.

  In this embodiment, the dichroic layer 134 that transmits excitation light and reflects light in other wavelength bands is formed on the entire surface of the substrate 130 on the side where the light emitting member is disposed. Dichroic layers 134 with different characteristics may be formed in the region. For example, the entire surface of the first region 141 is coated with a coating that transmits other wavelength band light other than red light including excitation light and reflects red light, and the entire region of the second region 142 is green light including excitation light. A coating that transmits light in other wavelength bands and reflects green light may be applied, and the dichroic layer 134 may not be formed on the entire surface of the third region 143 without applying the coating.

  Further, in this base material 130, a non-reflective coating layer 133 is formed by coating on the entire surface on the side opposite to the side where the phosphor layer 131 and the diffusion layer 135 formed as a light emitting member are disposed.

  The excitation light source 72 irradiates the light emitting member disposed in each segment region of the base material 130 with directional excitation light, and the red and green phosphors in the first region 141 and the second region 142 The laser light emitting device emits blue wavelength band light, which is visible light having a shorter wavelength than red and green wavelength band light emitted from the layers 131R and 131G.

  Further, the excitation light from the excitation light source 72 is formed corresponding to the shape of the light guide device 75 in order to increase the amount of monochromatic light emitted from one light emitting member and improve the utilization efficiency of effective light. An incident mask 136 having an opening is disposed between the excitation light source 72 and the light emission wheel 71.

  Next, light emitted from the light emitting wheel 71 and incident on the light guide device 75 will be described. When the first region 141 is irradiated with directional excitation light from the excitation light source 72, the excitation light is almost reflected on the non-reflective coating layer 133 on the incident surface of the first region 141 toward the excitation light source 72 side. Without being transmitted, it enters the substrate 130. Then, the excitation light transmitted through the substrate 130 passes through the dichroic layer 134 and is irradiated to the red phosphor layer 131R. The phosphor of the red phosphor layer 131R absorbs the excitation light and emits red wavelength band light in all directions. Among these, the red light emitted toward the light guide device 75 enters the light guide device 75 as it is, and the red light emitted toward the base material 130 is reflected by the dichroic layer 134, and most of the reflected light is emitted. The light emitted from the wheel 71 is incident on the light guide device 75.

  Similarly, when directional excitation light is irradiated from the excitation light source 72 to the second region 142, green light is incident on the light guide device 75 using green wavelength band light as emission light.

  Then, when excitation light that is blue wavelength band light is irradiated from the excitation light source 72 to the third region 143, the excitation light is applied to the non-reflective coating layer 133, the base material 130, and the dichroic layer 134 in the third region 143. Is transmitted to the diffusion layer 135. The diffusion layer 135 emits light incident on the diffusion layer 135 in the third region 143 as diffused light similar to the light emitted from the first and second regions 141 and 142. Therefore, in the third region 143 as described above, the diffusion layer 135 that imparts a diffusion effect to the incident blue excitation light is formed. Therefore, when the third region 143 is irradiated with the excitation light, the diffused blue color is diffused. Light in the wavelength band is incident on the light guide device 75 as emitted light.

  As shown in FIG. 5, the light guide device 75 in the present embodiment is a tapered light tunnel formed in a hollow, substantially quadrangular pyramid shape. This tapered light tunnel has four trapezoidal plates that form the top, bottom, left, and right surfaces with an entrance surface and an exit surface perpendicular to the optical axis, and by bonding and fixing each in the vicinity of the ridgeline of each plate It is formed in a substantially quadrangular frustum shape whose cross-sectional area expands from the entrance surface to the exit surface, and the inner surface is a reflection surface. Then, by making the length and width of the exit surface approximately twice the length and width of the entrance surface of the tapered light tunnel, the incident diffused light is transferred from the exit surface to the optical axis. On the other hand, it can be set as a light beam having a spread of about 30 degrees.

  The light guide device 75 is not a tapered light tunnel, but the length of the entrance surface and the exit surface are the same length and the length of the width is the same, and a condenser lens group is arranged on the entrance surface side of the light tunnel. The diffused light emitted from the light emitting wheel 71 may be condensed by the condenser lens group and incident on the light tunnel. The light guide device 75 is not limited to the light tunnel, and a solid glass rod may be used.

  Thus, when the light emitting wheel 71 is rotated and directional excitation light is emitted from the excitation light source 72, red, green, and blue wavelength band lights are sequentially incident on the light guide device 75 from the light emission wheel 71, and the excitation light source 72 When the DMD which is the display element 51 of the projector 10 displays the data in a time-sharing manner in accordance with the irradiation timing, a color image is generated on the screen.

  As described above, the light source device 63 includes the rotating plate in which different light emitting members are arranged on the circular base material 130, and the excitation light source 72 that irradiates the light emitting member with the excitation light, and the rotating plate is rotated. By continuously irradiating the light emitting member with directional blue excitation light, it is possible to sequentially generate wavelength band light of each color. However, as shown in FIG. 6A, if the excitation light source 72 continues to irradiate the rotating rotating plate with the blue excitation light, it will be on the optical axis of the excitation light source 72 between the light emitting member and the light emitting member. When the small gap 138 to be formed is positioned, the excitation light passes through the gap 138 as it is to the light guide device 75 side. As a result, the excitation light that has passed through the gap 138 enters the light guide device 75, and a blue spot is formed in the image projected on the screen. Further, when the number of light source bodies constituting the excitation light source 72 is increased in order to obtain a predetermined luminance, the blue spot projected on the screen also increases.

  Here, FIG. 6A and FIG. 8 to be described later are front sectional views of the rotating plate schematically showing that the light emitting members of the rotating plate rotating on the optical axis of the excitation light source 72 are sequentially positioned. The rotational movement is represented as a one-way movement from right to left.

  Therefore, the light source device 63 according to the present invention turns off the excitation light source 72 when the gap 138 between the light emitting members and the periphery of the gap 138 are positioned on the optical axis of the excitation light source 72 as shown in FIG. The control means is provided to prevent the excitation light from passing through the gap 138 to the light guide device 75 as it is. This control means may be included in a part of the projector control means, or may be provided directly in the light source device 63. Here, FIG. 6B is a front sectional view of the rotating plate schematically showing the position where the excitation light source 72 is turned on and the position where it is turned off.

  Thus, the excitation light does not pass through the gap 138 formed between the phosphor layer 131 and the diffusion layer 135, which are light emitting members, and does not enter the light guide device 75. Will not be formed. Therefore, in this way, when the gap 138 between the light emitting members and the periphery of the gap 138 are positioned on the optical axis of the excitation light source 72 by the control means, the excitation light source 72 is turned off, and the light emitting member is placed on the optical axis of the excitation light source 72. By controlling the excitation light source 72 to blink so that the excitation light source 72 is turned on when positioned, only diffused light in the red, green, and blue wavelength bands can be sequentially incident on the light guide device 75. The excitation light having a characteristic is prevented from being emitted from the light source device through the gap 138 between the light emitting members without being irradiated to the light emitting member, and the display of the projector 10 according to the irradiation timing of the excitation light source 72 Provided is a light source device 63 capable of projecting a clear color image on a screen by the DMD being the element 51 displaying data in a time-sharing manner, and a projector 10 equipped with the light source device 63 Rukoto can.

  Further, rigidity can be provided by using the base material 130 as a glass base material, or weight reduction and cost reduction can be achieved by using the base material 130 as a transparent resin base material.

  Further, since the dichroic layer 134 is formed on the surface of the base material 130 on which the phosphor layer 131 as the light emitting member is disposed, the light emitted to the base material 130 side is reflected to the light guide device 75 side. Thus, the amount of light incident on the light guide device 75 can be increased. Furthermore, since the non-reflective coating layer 133 is formed on the surface opposite to the side on which the phosphor layer 131 and the diffusion layer 135 as the light emitting member of the base material 130 are disposed, the excitation light source 72 emits light. The utilization efficiency of excitation light can also be improved.

  Then, by making the excitation light from the excitation light source 72 into blue wavelength band light having a shorter wavelength than the predetermined wavelength band light emitted from each phosphor layer 131, each of the phosphors irradiated with the excitation light The phosphor of the layer 131 can generate light having a wavelength band different from that of the excitation light, and can be used as a monochromatic light source, and the excitation light emitted from the excitation light source 72 is transmitted through the diffusion layer 135 so that the phosphor layer Diffused light similar to the light emitted from 131 can be emitted from the diffusion layer 135. Accordingly, since the excitation light source 72 can also be used as a single color light source, the installation area of the relatively expensive phosphor layer 131 can be reduced, and the inexpensive light source device 63 and the light source device 63 can be reduced. The projector 10 provided can be provided.

  As for the combination of the predetermined wavelength band light emitted from the excitation light source 72 and the predetermined wavelength band light emitted from the plurality of phosphor layers 131, the above-described excitation light is used as the blue wavelength band light, and light is emitted. Various modes can be adopted without being limited to the case where the light emitted from the wheel 71 is the primary wavelength band light.

  For example, a phosphor layer 131 that emits a yellow wavelength band light that is a complementary color may be disposed in each segment region in addition to a phosphor layer 131 that emits a primary wavelength band light. Thereby, the luminance of the light source device 63 can be increased to improve the color reproducibility. In addition, as a constant arrangement pattern in the circumferential direction of the phosphor layer 131, light of three wavelength bands is repeatedly emitted from the six segment regions so as to be red, green, blue, red, green, and blue. May be. Thereby, it is possible to prevent color separation due to the color braking phenomenon without changing the rotation speed of the light emitting wheel 71.

  Further, the excitation light emitted from the excitation light source 72 is a wavelength band light in the ultraviolet region or a violet wavelength band light, and a phosphor that emits red, green, or blue wavelength band light without the diffusion layer 135 being disposed. The layer 131 may be disposed in each segment region of the light emitting wheel 71 in some cases.

  The excitation light source 72 is not limited to the case where one type of wavelength band light is used as the excitation light, and may be configured to emit a plurality of types of wavelength band light as the excitation light. For example, as shown in FIG. 7, the excitation light source 72 includes a plurality of blue light source bodies 70B that emit excitation light in a blue wavelength band and a plurality of ultraviolet light source bodies that emit excitation light in an ultraviolet wavelength band. 70U, and each of the light source bodies 70 irradiates excitation light only to the corresponding light emitting member.

  Further, on the rotating plate of the light emitting wheel 71, a red phosphor layer 131R which is a light emitting member that receives blue light as excitation light and emits light in a red (R) wavelength band is fixed to the first region 141, A green phosphor layer 131G, which is a light emitting member that receives blue light as excitation light and emits light in the green (G) wavelength band, is fixed to the second region 142, and receives blue light (excitation light as ultraviolet light). A blue phosphor layer 131B, which is a light emitting member that emits light in the wavelength band B), is fixed to the third region 143.

  The excitation light source 72 is arranged so that the optical axis of each light source body 70, the optical axis of the light guide device 75, and the rotation axis of the light emitting wheel 71 are parallel to each other. In addition, the excitation light condensing lens 139 is arranged so that the excitation light is condensed on the phosphor layer 131 attached to the light-emitting wheel 71.

  Similarly to the above, the excitation light source 72 is turned off by the control means when the gap 138 between the light emitting members and the periphery of the gap 138 are positioned on the optical axis of the excitation light source 72, and the excitation light source 72 is turned off. When the light emitting member is positioned on the optical axis, the blinking control is performed so that the excitation light source 72 is turned on, and the red and green phosphor layers 131R of the rotating plate are on the optical path of the excitation light emitted from the blue light source 70B. , 131G is turned on only when the blue light source body 70B is turned on, and when the blue phosphor layer 131B is located on the optical path of the emitted light from the blue light source body 70B, the blue light source body 70B is turned off. The UV light source 70U is turned on only when the blue phosphor layer 131B of the rotating plate is positioned on the optical path of the UV light that is controlled and emitted from the UV light source 70U, and the light emitted from the UV light source 70U When the red and green phosphor layers 131R and 131G are located on the optical path of And it is controlled so as to turn off the 70U.

  In this way, by controlling blinking in conjunction with the rotating plates rotating the blue and ultraviolet light source bodies 70B and 70U, two different wavelength band lights are sequentially switched and emitted from the excitation light source 72, and the excitation light is emitted. Red, green, and blue wavelength band light is sequentially generated from the absorbed phosphor. As described above, the DMD that is the display element 51 of the projector 10 displays the data in a time-sharing manner in accordance with the irradiation timing of the excitation light source 72, so that a clear color image can be generated on the screen.

  The light source device 63 is not limited to the case where the excitation light source 72 is disposed on the side opposite to the emission surface of the light emitting wheel 71, and the excitation light source 72 may be disposed only on the emission surface side of the rotating plate. . When the excitation light source 72 is disposed on the emission surface side, the excitation light source 72 is configured such that the excitation light emitted from the excitation light source 72 is irradiated on the light emitting member of the substrate 130 on the emission surface side of the substrate 130. And arranged at a predetermined angle at a predetermined distance from the optical axis of the light guide device 75 so as not to block light emitted from the light emitting wheel 71 and entering the light guide device 75. It is.

  When the excitation light source 72 is arranged only on the exit surface side of the rotating plate in this way, a reflective layer that reflects the excitation light may be formed on the exit surface of the rotating plate. Therefore, in this case as well, the excitation light can be prevented from entering the light guide device 75 by controlling the excitation light source 72 of the light source device 63 to blink by the control means in the same manner as described above.

  Further, as shown in FIG. 8, a light shielding member 150 that shields the excitation light may be disposed in the gap 138 between the light emitting members on the emission surface of the rotating plate of the light emitting wheel 71. Since the light shielding member 150 only needs to prevent directivity excitation light from directly entering the light guide device 75, the light shielding member 150 is formed as a diffusion layer to diffuse the directivity excitation light. It may be emitted. Note that only the light shielding member 150 may be installed on the rotating plate, but by further coating the anti-reflective coating layer 133 or the like, the light shielding member 150 can be arranged to rotate the rotating plate without forming a convex portion. The accompanying wind noise can also be suppressed.

  Thus, by arranging the light blocking member 150 that blocks the excitation light in the gap 138 between the light emitting members of the rotating plate, it is possible to prevent the directional excitation light from entering the light guide device 75 more reliably. be able to.

  As shown in the drawing, the light shielding member 150 is not limited to the case where the light shielding member 150 is disposed on the light emitting member so as to cover the gap 138 between the light emitting members of the rotating plate. A light-emitting member is disposed on the light-shielding member 150, and a light-shielding member 150 formed of a highly elastic and flexible material such as rubber is inserted so that a slight gap may not be generated in the gap 138 having the predetermined width. Also good. Furthermore, various modes can be adopted for the material and installation position of the light shielding member 150, such as disposing a diffusion layer not only around the gap 138 but also on the entire surface of the light emitting member.

  The present invention is not limited to the above-described embodiments, and can be freely changed and improved without departing from the gist of the invention. For example, it is not limited to the case where the light emitting wheel 71 obtained by rotating a rotating plate in which the base material 130 is formed in a circular shape is used, but the piezoelectric material that forms the base material 130 in a rectangular shape and reciprocates the base material 130 in the major axis direction. A light emitting diaphragm formed by attaching the element to the substrate 130 may be employed.

  In this light emitting diaphragm, a rectangular segment region is formed on the base material 130, and a plurality of light emitting members that receive excitation light and emit light of a predetermined wavelength band are disposed on one surface of the segment region. In this light emitting diaphragm, a piezoelectric element is attached to one end of the base material 130. This piezoelectric element is connected to a control circuit, and when an AC voltage is applied to the piezoelectric element according to a command from the control unit 38, the piezoelectric element periodically expands and contracts, thereby causing the base material 130 to have a long axis. It will reciprocate in the direction. Therefore, if the excitation light source 72 is controlled to blink in accordance with the reciprocal movement of the base material, a clear image can be projected onto the screen without irradiating the excitation light to the gap 138 between the light emitting members, as described above. Can do.

1 is a perspective view showing an external appearance of a projector according to an embodiment of the invention. FIG. 3 is a diagram illustrating a functional circuit block of the projector according to the embodiment of the invention. FIG. 2 is a plan view of the projector according to the embodiment of the present invention with the top plate removed. The perspective view which shows the external appearance of the light source device which concerns on the Example of this invention. The top view and front sectional drawing of the light source device which concern on the Example of this invention. The front sectional view of the rotating plate schematically showing the state where the light emitting wheel of the light source device according to the embodiment of the present invention is rotated, and the rotating plate schematically showing the position where the excitation light source of the light source device is turned on or off. Front sectional drawing. The top view of the light source device which concerns on the Example of this invention. The front sectional view of the rotating board which shows typically the state where the light emission wheel of the light source device concerning the example of the present invention rotates.

Explanation of symbols

10 Projector 11 Top plate
12 Front plate 13 Back plate
14 Right side plate 15 Left side plate
17 Exhaust hole 18 Intake hole
19 Lens cover 20 Various terminals
21 I / O connector 22 I / O interface
23 Image converter 24 Display encoder
25 Video RAM 26 Display driver
31 Image compression / decompression unit 32 Memory card
35 Ir receiver 36 Ir processor
37 Key / Indicator section 38 Control section
41 Power supply control circuit 43 Cooling fan drive control circuit
45 Lens motor 47 Audio processor
48 Speaker 51 Display element
53 Display element heat sink 61 Light source side optical system
62 Projection-side optical system 63 Light source device
70 Light source 70B Blue light source
70U UV light source 71 Light-emitting wheel
72 Excitation light source 73 Wheel motor
74 Reflection mirror 75 Light guide device
77 Optical unit block 78 Illumination side block
79 Image generation block 80 Projection side block
83 Condensing lens group 84 Irradiation mirror
86 Optical system control board 93 Fixed lens group
97 Movable lens group 101 Power supply circuit block for light source
102 Power supply control circuit board 103 Control circuit board
110 Blower 111 Air inlet
113 Discharge port 114 Exhaust temperature reduction device
120 Partition wall 121 Inlet side space
122 Exhaust side space 130 Base material
131 phosphor layer 131R red phosphor layer
131G green phosphor layer 131B blue phosphor layer
133 Non-reflective coating layer 134 Dichroic layer
135 Diffusion layer 136 Incident mask
138 Gap 139 Excitation light condensing lens
141 First area 142 Second area
143 Third area 150 Light-shielding member

Claims (12)

A rotating plate that is arranged adjacent to the circumferential direction of a circular base material in which different light emitting members that receive directivity excitation light and emit light of a predetermined wavelength band can be rotationally controlled;
An excitation light source for irradiating the light emitting member with the excitation light;
Control means for turning off the excitation light source so that the light of the excitation light source does not pass through the gap between the light emitting members in a directional state when the gap between the light emitting members is positioned on the optical axis of the excitation light source When,
A light source device comprising: The excitation light source emits excitation light in a blue wavelength band,
The rotating plate includes a light emitting member that emits red wavelength band light upon receiving the excitation light, a light emitting member that emits green wavelength band light upon receiving the excitation light, and diffuses the incident excitation light. The light source device according to claim 1, further comprising: a light emitting member that emits light. The excitation light source emits excitation light in a blue wavelength band and excitation light in an ultraviolet wavelength band,
The rotating plate includes a light emitting member that emits red wavelength band light by receiving excitation light in the blue wavelength band, and a light emitting member that emits green wavelength band light by receiving excitation light in the blue wavelength band; The light source device according to claim 1, further comprising: a light emitting member that emits blue wavelength band light in response to excitation light in the ultraviolet wavelength band.   The blue wavelength band excitation light source is turned on when a light emitting member that emits the red wavelength band light or a light emitting member that emits the green wavelength band light is positioned on the optical path, and the blue wavelength band is on the optical path. The light source device according to claim 3, wherein the light source device is controlled to blink so as to be turned off when a light emitting member that emits light in the wavelength band is positioned.   The excitation light source of the ultraviolet wavelength band is turned on when a light emitting member that emits the blue wavelength band light is positioned on the optical path, and the light emitting member that emits the red wavelength band light on the optical path and the green light source 5. The light source device according to claim 3, wherein the light source device is controlled to blink so that the light emitting member that emits light in the wavelength band is turned off when the light emitting member is positioned.   6. The light source device according to claim 1, wherein the rotating plate includes a light shielding member that shields excitation light in a gap between the light emitting members.   The light source device according to claim 6, wherein the light shielding member is formed as a diffusion layer.   The light source device according to claim 6, wherein the light shielding member is formed flat together with the non-reflective coating layer. The light source device according to claim 6, wherein the light shielding member is made of a flexible material.   6. The light source device according to claim 1, wherein a diffusion layer is disposed on the entire surface of each of the light emitting members. A diaphragm arranged adjacent to a rectangular base material capable of reciprocating different light emitting members that receive directional excitation light and emit light of a predetermined wavelength band;
An excitation light source for irradiating the light emitting member with the excitation light;
Control means for turning off the excitation light source so that the light of the excitation light source does not pass through the gap between the light emitting members in a directional state when the gap between the light emitting members is positioned on the optical axis of the excitation light source When,
A light source device comprising: A light source device, a display element, a light source side optical system that guides light from the light source device to the display element, a projection side optical system that projects an image emitted from the display element onto a screen, and the light source device And a projector control means for controlling the display element,
The projector according to claim 1, wherein the light source device is the light source device according to claim 1.

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